I'll try to explain my reasoning
48/2(9+3) =
48/2(12) = (to multiply 12 in to a fraction you must make it a fraction)
48/2(12/1)= (multiply the tops together and the bottoms)
576/2=
288
that's how I was taught sorry If I'm wrong

Yes i know. They really are ignorant and don't know the simplest math. doing 9+3 IS solving the parenthesis and therefor there can be removed, and then you solve it from left to right. It's SO simple. I don't understand how these people cannot understand it.